NORTH AMERICAN HYMENOPTERA. 



303 



pressed and obliquely truncate at tip, at base there is a longitudinallj' strigose 

 rim ; wings hjaline, with veins of a decided yellowish cast. 



This beautiful species is described from a single specimen which lodged 

 on my shoulder as I passed through a swamp, and is easily recognized 

 from all others of this genus. 



The Trees and Plants on which the North American Cynipid/E are 

 found, with a List of the Desciibed Species found thereon. 



THE 

 Enceno Oak. 

 ( Quercus agrifoKa) 

 Andricus pomiformis, B. 

 Callirhytis agrifolise, B. 

 Cynips echinus, 0. S. 



■ White Oak. 

 ( Quercus alba) 

 Acraspis pezomachoides, 0. S. 



" forticornis, W. 

 Andricus fusiformis, 0. S. 

 " lana, F. 

 " utriculus, B. 

 " floeei, W. 

 Callirhytis clavula, B. 

 tuber, F. 

 " futilis, 0. S. 



'• seminator, H. 



Cynips juglans, 0. S. 

 ■' cicatricula, B. 

 " pi sum, F. 

 Holcaspis globulus, F. 

 Loxaulis mammula, B. 

 Neuroterus batatus, B. 

 " majalis, B. 



" minutus, B. 



" vesiculus, B. 



Watek Oak. 

 ( Quei-cus aquatica) 

 Dryophanta aquaticse, A. 

 Andricus Turnerii, A. 

 Amphibolips melanocera, A. 



Swamp White Oab". 

 {Quercus bicolor) 

 Andricus ignotus B. 

 Callirhytis capsulus. B. 



OAKS (CiipuliferoE). 



Cynips strobilana, 0. S. 



Neuroterus noxiosus, B. 



" floccosus, B. 



Black Jack, or Scrub Oak. 

 ( Quercus Catesbaei) 

 Andricus Catesbaei, A. 

 " omnivorus, A. 

 " capsualus, A. 



Upland Willow, or Blue Jack Oak. 



( Quercus cinerea) 

 Amphibolips cinerea, A. 

 Andricus omnivorus, A. 

 " medullse, A. 

 " gemmarius, A. 

 " capsualus, A. 



Scarlet Oak. 

 ( Quercus coccinea) 

 Amphibolips coccinese, 0. S. 



nanus, 0. S. 

 Andricus Osten Sackenii, B. 



Laleei, Oak. 

 ( Quercus laurifolia) 

 Amphibolips racemaria, A. 

 •' citriformis, A. 



Andricus rugosus, A. 



•' clavigerus, A. 

 Holcaspis fuliginosa, A. 

 Neuroterus confusus, A. 

 " coniferus, A. 



Burr Oak, Overcup Oak. 

 {Quercus ficula) 

 Holcaspis ficula, B. 



